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Geometric effects on competing failure modes in lap shear testing of spot joints

China Welding 2022年第3期31卷 8-16页

作者： Tushar Telmasre Abdelrahman Abdelmotagaly 高雁飞于真真 Department of Metallurgical and Materials Engineering Colorado School of MinesGoldenCO 80401USA Department of Materials Science and Engineering University of TennesseeKnoxvilleTN 37996USA

When subjected to the lap shear testing,spot welds created by brazing,resistance welding,or other techniques may fail either by a plug failure mode(also called pull-out mode)or an interfacial shear failure *** the past,plug failure mode was thought to be dependent on base metal ultimate tensile strength,spot diameter and plate thickness,while interfacial failure can be determined by interface shear strength and spot *** fracture mechanics model or failure process is invoked in such an approach,and its predictive capability is often doubted compared to realistic *** work conducts a parametric study to assess the failure behavior as a function of dominant three-dimensional geometric parameters based on the Gurson-Tvergaard-Needleman(GTN)damage mechanics model and no-damage model *** necking conditions are considered as precursors to the two failure modes in the no-damage *** is found out that a small ratio of spot diameter to plate thickness promotes interfacial shear failure while a large ratio favors plug *** geometric parameters such as the filler interlayer thickness,if used,play a secondary *** calculated peak force F_(wt)is not much different between the GTN and no-damage analyses,and better agreement is shown in the small nugget *** peak force calculated from the GTN model with the porosity f_(0)set to 0.01 showed the best agreement with pervious tensile shear tests on spot-welded DP980 lap joints in comparison to that calculated from the GTN model with f_(0)at 0.02 and the no-damage *** that heterogeneous distribution of material strength across the joint region was considered in the GTN model,which was estimated based on the hardness map measured across the joint cross section.

关键词： spot welding failure modes damage mechanics

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STUDY OF failure modes OF MICROELECTRONIC PACKAGING MODULES BY HOLOGRAPHY QUASI PROJECTION MOIRE METHOD

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Acta Mechanica Sinica 1997年第2期13卷 179-185页

作者：史训清刘宝琛戴福隆 Dept.of Power Eng. Beijing Univ.of Aeronautics & AstronauticsBeijing 100083China Department of Engineering Mechanics Tsinghua UniversityBeijing 100084China

In this paper, a novel interferometric method with a wide range of sensitivities, called holography quasi projection moire, is proposed. It combines the features of the variated double projection moire method and the holographic interferometry method. This technique is used to study the failure modes of microelectronic packaging modules.

关键词： holography quasi projection moire sensitivity failure modes packaging modules

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Short beam shear properties and failure modes of the wood-based X-type lattice sandwich structure

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Journal of Forestry Research 2021年第2期32卷 877-887页

作者： Tengteng Zheng Liuxiao Zou Yingcheng Hu Key Laboratory of Bio-based Material Science and Technology Ministry of EducationNortheast Forestry UniversityHarbin 150040People’s Republic of China

A wood-based X-type lattice sandwich structure was manufactured by insertion-glue *** birch was used as core,and Oriented Strand Board was used as panel of the sandwich *** short beam shear properties and the failure modes of the wood-based X-type lattice sandwich structure with different core direction(vertical and parallel),unit specification(120 mm×60 mm and 60 mm×60 mm),core size(50 mm and 60 mm),and drilling depth(9 mm and 12 mm)were investigated by a short beam shear test and the establishment of a theoretical model to study the equivalent shear modulus and deflection response of the X-type lattice sandwich *** from the short beam shear test and the theoretical model showed that the failure modes of the wood-based X-type lattice sandwich structure were mainly the wrinkling and crushing of the panels under three-point bending *** experimental values of deflection response of various type specimens were higher than the theoretical values of *** the core direction of parallel,the smaller the unit specification is,the shorter the core size is,and the deeper the drilling depth is,the greater the short beam shear properties of the wood-based X-type lattice sandwich structure is.

关键词： X-type Lattice sandwich structure failure modes Short beam shear properties Theoretical model

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Statistical analysis of the failure modes and causes of the failure blades of the aviation engine

Statistical analysis of the failure modes and causes of the ...

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2012年海峡两岸破坏科学/材料试验学术会议

作者： MA Nan-nan failure Analysis Center of Aviation Industries of China Beijing Institute of Aeronautical Materials

Based on the failure analysis of failure Analysis Center of Aviation Industry of China in recent years,the materials selection process in the blades of the aviation engine is illustrated, the common failure modes and causes of the failure blades of the aviation engine are discussed, we found that the 90%of the common failure mode in gas turbine blades and compressor blades is fatigue and these variations may be directly linked to the mechanism of *** paper focuses on the important meaning of failure analysis on the security and reliability of the blades of the aviation *** is discovered that the blades of the aviation engine designs and the procedures of the manufacturer are key points to the security and reliability of the blades in *** further research of comprehensive failure analysis of the blades of the aviation engine can increase the reliability of the blades under the service conditions.

关键词： aviation engine blades failure modes failure reasons

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Investigation of hydroxyl-terminated polybutadiene propellant breaking characteristics and mechanism impacted by submerged cavitation water jet

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Defence Technology（防务技术） 2024年第3期33卷 559-572页

作者： Wenjun Zhou Meng Zhao Bo Liu Youzhi Ma Youzhi Zhang Xuanjun Wang Zhijian Laboratory Rocket Force University of EngineeringXi’an710025China

A submerged cavitation water jet(SCWJ)is an effective method to recycle solid propellant from obsolete solid engines by the breaking *** propellant's breaking modes and mechanical process under SCWJ impact are *** study aims to understand those impact breaking *** hydroxyl-terminated polybutadiene(HTPB)propellant was chosen as the research material,and a self-designed test system was used to conduct impact tests at four different working *** high-speed camera characterized crack propagation,and the DIC method calculated strain change during the impact ***,micro and macro fracture morphologies were characterized by scanning electron microscope(SEM)and computed tomography(CT)*** results reveal that the compressive strain concentration region locates right below the nozzle,and the shear strain region distributes symmetrically with the jet axis,which increases to 4% at first 16th ms,the compressive strain rises to 2% and 6% in the axial and transverse direction,*** two tensile cracks formed first at the compression strain concentrate region,and there generate many shear cracks around the tensile cracks,and those shear cracks that develop and aggregate cause the cracks to become wider and cut through the tensile cracks,forming the tensile-shear cracks and the impact parts eventually *** HTPB propellant forms a breaking hole shaped conical after impact 10 *** mass loss increases by 17 times at maximum,with the working pressure increasing by three ***,the damage value of the breaking hole remaining on the surface increases by 7.8 times while 2.9 times in the depth of the breaking *** breaking efficiency is closely affected by working *** failure modes of HTPB impacted by SCWJ are classified as tensile crack-dominated and tensile-shear crack-dominated damage mechanisms.

关键词： Submerged cavitation water jet Hydroxyl-terminated polybutadiene propellant Breaking characteristics failure modes

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Experimental and numerical study regarding H-steel all-bolted connection steel frame with composite wall boards

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Earthquake Engineering and Engineering Vibration 2024年第2期23卷 427-443页

作者： Fan Min Guo Hongchao Li Shen Wang Zhenshan Wang Huaqiang School of Civil Engineering and Architecture Xi’an University of TechnologyXi’an 710048China State Key Laboratory Base of Eco-Hydraulic Engineering in Arid Area Xi’an University of TechnologyXi’an 710048China

H-steel all-bolted connection steel frame structures with heat preservation and decoration composite wall boards were investigated and the seismic performances of three scaled specimens were *** failure modes,hysteresis curves,bearing capacity,ductility,energy dissipation capacity,stiffness degradation and strain distribution were *** calculation method of structural theoretical internal force was *** results showed that the overall structural seismic performance was better,and the structural ductility met the demands of elastic-plastic inter-story drift angle for seismic *** H-steel weak-axis connection structure obtained better energy dissipation capacity,and its bearing capacity and stiffness were slightly different from the strong-axis *** heat preservation and decoration performance of composite wallboard and the all-bolted connection of the steel frame realized prefabrication during the whole construction *** plastic hinge of the steel beam can be moved outwards because of the L-angles,which effectively avoids stress concentration in joint areas and expands the plastic hinge *** errors between the theoretical structural capacity calculated by the plastic analysis method and the test results were within 2.44%.In addition,structural failure mechanisms and bearing capacities were verified by the finite element(FE)analysis,and the effects of the main parameters on the structures were *** FE verification results were the same as in the *** research results provide theoretical support and technical guidance for the application of thermal insulation and decorative composite wall panels in H-shaped steel all-bolted steel frames.

关键词： composite wall boards all-bolted steel frame H-steel low-cyclic loading failure modes

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Ballistic performance of spherical fragments penetrating PCrNi3MoV target plates

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Defence Technology（防务技术） 2024年第3期33卷 295-307页

作者： Dou Hong Wenbin Li Yu Zheng Yiming Li Ning Jiang Kebin Zhang Ministerial Key Laboratory of ZNDY Nanjing University of Science and TechnologyNanjingChina

PCrNi3MoV steel is a medium-carbon,low-alloy quenched and tempered steel that finds its applications in military gun barrels due to the high wear resistance and ablation *** study the penetration and failure modes of PCrNi3MoV plates impacted by tungsten spheres,tungsten spheres of various diameters(5 mm,8 mm,and 10 mm)were used to impact PCrNi3MoV steel plates with thicknesses of 6 mm,9 mm,and 14 *** penetration performance of the spheres was analyzed for different velocities,and the ultimate penetration velocity of the plate was *** was found that the primary failure modes of the PCrNi3MoV plate were compression pitting failure and shear *** the dimensional analysis method,a relationship between the bulge height of the steel plate and the fragment velocity,an equation for the ultimate penetration velocity,and a relationship between the target penetration energy and the fragment velocity were ***,a projectile-target action index was proposed to describe the process of tungsten spheres with different velocities impacting target *** results suggested that under the same thickness of the target plate,a larger-diameter fragment required more kinetic energy to obtain the same ultimate penetration effect as a smaller-diameter *** equations obtained through dimensional analysis predicted values that agreed well with experimental values,indicating that these equations can be applied to engineering applications.

关键词： Impact damage Ultimate penetration velocity Bulge height Target penetration energy failure modes

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Dynamic impact properties of deep sandstone under thermal-hydraulicmechanical coupling loads

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Journal of Mountain Science 2024年第6期21卷 2113-2129页

作者： CAO Chunhui DING Haonan ZOU Baoping School of Civil Engineering and Architecture Zhejiang University of Science and TechnologyHangzhou 310023China Zhejiang-Singapore Joint Laboratory for Urban Renewal and Future City Hangzhou 310023China

The deep rock mass within coal mines situated in a challenging environment are characterized by high ground stress,high geotemperature,high osmotic water pressure,and dynamic disturbances from mechanical *** investigate the impact of this complex mechanical environment on the dynamic characteristics of roof sandstone in self-formed roadways without coal pillars,standard specimens of deep sandstone from the 2611 upper tunnel working face of the Yongmei Company within the Henan Coal Chemical Industry Group in Henan,China were prepared,and an orthogonal test was *** a self-developed geotechnical dynamic impact mechanics test system,triaxial dynamic impact tests under thermal-hydraulicmechanical coupling conditions were conducted on deep *** results indicate that under high confining pressure,deep sandstone exhibits pronounced brittle failure at low temperatures,with peak strength gradually decreasing as temperature and osmotic water pressure ***,under low confining pressure and low temperature,the brittleness of deep sandstone weakens gradually,while ductility ***,sandstone demonstrates higher peak strength at low temperatures under high axial pressure conditions,lower peak strength at high temperatures,and greater strain under low axial pressure and high osmotic water *** in impact air pressure and osmotic water pressure have proportionally greater effects on peak stress and peak *** 50%of the input strain energy is utilized as effective energy driving the sandstone fracture *** analysis identifies the optimal combination of factors affecting the peak stress and peak strain of *** the coupling effect,intergranular and transgranular fractures occur within the *** images illustrate that the damage forms range from minor damage with multiple fissures to extensive fractures and severe *** study elucidates the varied dynamic impact me

关键词： Deep sandstone Thermal-hydraulicmechanical coupling Dynamic impact Stress-strain failure modes Polar analysis

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A Review of Basic Mechanical Properties of Bamboo Scrimber Based on Small-Scale Specimens

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Journal of Renewable Materials 2024年第4期12卷 869-894页

作者： Xin Xue Haitao Li Rodolfo Lorenzo College of Civil Engineering Nanjing Forestry UniversityNanjing210037China National-Provincial Joint Engineering Research Center of Biomaterials for MACHINERY PACKAGE Nanjing Forestry UniversityNanjing210037China Jiangsu Engineering Research Center of Bamboo and Wood Carbon FixationMaterials and Structures Nanjing Forestry UniversityNanjing210037China Department of Civil Environmental and Geomatic EngineeringUniversity College LondonLondonWC1E 6BTUK

This review summarizes the existing knowledge about the mechanical properties of bamboo scrimber(BS)in *** to literature reviews,the strength of BS under different load modes is affected by a series of factors,such as the type of original bamboo,growth position,resin content,treatment method and ***,different production processes can be adopted according to different requirements,and bamboo scrimbers can also be classified *** addition,this review summarizes the changes in different factors considered by scholars in the research on the mechanical properties of BS,so that readers can have an overall understanding of the existing research and make more innovative and valuable research on this *** review provides and discusses the conclusive observations,the current research gaps and future research directions on the mechanical properties of BS.

关键词： Bamboo scrimber manufacturing process mechanical properties failure modes constitutive model

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Rotational failure analysis of spherical-cylindrical shell pressure controllers related to gas hydrate drilling investigations

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Petroleum Science 2022年第2期19卷 789-799页

作者： Cong Li Jian-Liang Pei Nian-Han Wu Gui-Kang Liu Wei Huang Zhi-Xu Dai Rui-Ze Wang Zhao-Fan Chen Wei-Cheng Long MOE Key Laboratory of Deep Earth Science and Engineering Sichuan UniversityCollege of Water Resource and HydropowerSichuan UniversityChengdu610065China Guangdong Provincial Key Laboratory of Deep Earth Sciences and Geothermal Energy Exploitation and Utilization Institute of Deep Earth Sciences and Green EnergyCollege of Civil and Transportation EngineeringShenzhen UniversityShenzhen518060China China Pingmei Shenma Energy and Chemical Industry Group Co. Ltd.Pingdingshan467000China State Key Laboratory of Coking Coal Exploitation and Comprehensive Utilization Pingdingshan467000China Xi'an Research Institute China Coal Technology and Engineering GroupXi©an710077China

In situ pressure-preserved coring(IPP-Coring)technology is considered one of the most efficient methods for assessing ***,seal failure caused by the rotation of pressure controllers greatly affects the success of pressure *** this paper,a novel spherical-cylindrical shell pressure controller was *** finite element analysis model was used to analyze the stress distribution and deformation characteristics of the pressure controller at different rotation *** seal failure mechanism caused by the rotation of the pressure controller was *** stress deviation rate was defined to quantitatively characterize the stress *** on the test equipment designed in this laboratory,the ultimate bearing strength of the pressure controller was *** results show that the rotation of the valve cover causes an increase in the deformation on its lower ***,the specific sealing pressure in the weak zone is greatly reduced by a statistically significant amount,resulting in seal *** the valve cover rotates 5°around the major axis,the stress deviation rate is-92.6%.To prevent rotating failure of the pressure controller,it is necessary to control the rotation angle of the valve cover within 1°around the major *** results of this research can help engineers reduce failure-related accidents,provide countermeasures for pressure coring,and contribute to the exploration and evaluation of deep oil and gas resources.

关键词： Exploration of oil and gas resources Pressure coring controller Sphere flapper valve failure modes Stress deviation rate

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